time grid - context menu only working after loading, not after paging

[neffets]

After loading the stuff-to-do page in the time-grid table the right-mouse contextmenu for adding "log-time" is working.
After paging "prev week" / "next week", the right-mouse action gives an javascript alert box "no url"

• console shows no error
• seems that the ul#time-grid-menu is duplicated after paging, so there seems a markup failure